Bill, my Mustang rear has a small bend over tab spot welded to the pass side tube about 1/3 out from the center housing. Then just the small bolt on clip on the drivers side that you mentioned. Mine went through inspection as is with no problem. I think the 18" deal is more important for attachments along the frame memebers. One of the inspectors told me the primary thing they look for is that everything is secured well and that there is no posibility of anything rubing with tubing and wiring.
By the way where are you in Ct.